By Meghan Overdeep
Updated Jul 26, 2016 @ 10:15 am
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CANNES, FRANCE - MAY 12: Australian actress Naomi Watts attends the "Money Monster" premiere during the 69th annual Cannes Film Festival at the Palais des Festivals on May 12, 2016 in Cannes, France. (Photo by Dominique Charriau/WireImage)
Credit: Dominique Charriau/WireImage

They grow up so fast! Naomi Watts took to Instagram on Monday to celebrate the 9th birthday of her eldest son Alexander—whom she calls Sasha—with the sweetest snap of her and her no-so-little boy.

"Happy birthday to our first little miracle," she wrote alongside the 'gram that shows her and Sasha laying on a pile of blankets. The birthday boy is wearing a paper crown and gold beads draped around his neck in the photo, and smiles broadly at the camera with his head propped up on his mom's shoulder. "Sweet Sasha is adventurous, loving and kind. A powerful beam of light in our family. Feel so blessed to watch him grow."

Sasha, which is the Russian alternative to American nicknames for Alexander—like Alex—is Watts's oldest child with longtime partner Liev Schreiber. Watts, 47, gave birth to Sasha in 2007 after two years of dating Schreiber. They are also parents to 7-year-old son Samuel Kai.

Happy birthday, Sasha!